After starting a qube, opening “qube manager” showed the new qube, but pulling down the upper right “qubes domains” list did not show the new qube in the listing (despite the qube already being usable). That is until a shutdown of the qube was initiated from “qube manager” at which point it showed up in the pull down “qubes domains” list as “shutting down”.
Also, when opening the list of qubes when trying to redirect a usb device, the list did not have the new qube in the options.
This is in dom0 (not sys-gui or sys-gui-gpu)
I doubt this will be repeatable, so not reporting it as a bug on github, but it seems like it should be mentioned somewhere.